In animals with a closed circulatory system, gas exchange occurs across the thin walls of ________
A) arteries
B) arterioles
C) capillaries
D) venules
C
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In some studies that use observational rather than experimental data, investigators develop ____, which conceptually
predict what they would see if a particular factor had no effect.
a. control treatments b. null models c. experimental controls d. null treatments e. experimental models
Answer the following statements true (T) or false (F)
1. Thomas Hunt Morgan was the genetics researcher who discovered X-linked inheritance patterns by studying fruit flies. 2. Linkage maps are diagrams of nitrogen base sequences on DNA. 3. X-linked recessive disorders affect more females than males. 4. A male expresses an X-linked recessive disorder only if he inherits alleles conferring the disorder from both parents. 5. Variants or alternate forms of a gene are called alleles.
A trait that increases the environmental fitness of an organism is called a ________.
A. adaptation B. hibernation C. migration D. extinction
The regulatory centers for the respiratory and circulatory systems are found in the _____
A) cerebrum B) cerebellum C) thalamus D) medulla oblongata